Yanmar 3TNV82A-B, Service Manual

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GENERAL SERVICE INFORMATION
TNV DI Service Manual 4-9
MAIN ELECTRONIC CONTROL COMPONENTS AND FEATURES
MAIN ELECTRONIC CONTROL COMPONENTS AND FEATURES
4TNV84T-Z, 4TNV98-E, 4TNV98-Z,
4TNV98T-Z
Component/Feature Description
Engine controller (E-ECU) Adjusts the rack position of the fuel injection pump
depending on the speed command signal from the
accelerator sensor, thus regulating the engine speed and
power. The engine controller also regulates the opening of
the EGR valve depending on the engine speed and
power. It serves as the master station for the following
components/control features.
Electronic governor (Eco-governor) Consists of the engine speed sensor, rack actuator, etc.,
and is directly connected to the fuel injection pump in
order to regulate the rack position of the fuel injection
pump depending on the signals communicated with the E-
ECU.
Fuel injection pump (for Eco-governor) Is of single plunger type and equipped with a CSD
solenoid valve that allows the fuel injection timing to
advance and the injection quantity to increase, thereby
improving the cold start performance of the engine.
EGR valve Controls the exhaust gas recirculation flow rate
depending on the engine speed/load signals from the E-
ECU. It is installed on the top of the exhaust manifold.
Accelerator sensor Unlike mechanical governors, the Eco-governor has no
governor lever. The accelerator sensor serves as the
governor lever to provide the speed command signal
(voltage signal) to the E-ECU for engine speed control. It
is installed in the operator cabin of the driven machine.
Constant speed engines for e.g. generator use do not
require accelerator sensors because the engine speed
can be shifted via a switch on the operator's console.
Optional CAN communication capability is available as an option.
Fault indicator
Is installed on the operator's console. If a fault occurs in
the E-ECU or Eco-governor, the fault indicator flashes
alerting the operator to a fault. The number of flashes
and/or the flashing pattern vary depending on the type or
source of the fault, enabling quick-fix.
Optional
TNV_DI_SM_A4.book 9 ページ ２００７年１２月６日 木曜日 午前９時２３分